skeleton for /purses//deposit
This commit is contained in:
Christian Grothoff
parent
31c545b9e8
commit
1002ac13e4
609
src/exchange/taler-exchange-httpd_purses_deposit.c
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609
src/exchange/taler-exchange-httpd_purses_deposit.c
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/*
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This file is part of TALER
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Copyright (C) 2022 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU Affero General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file taler-exchange-httpd_purses_create.c
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* @brief Handle /purses/$PID/deposit requests; parses the POST and JSON and
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* verifies the coin signature before handing things off
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* to the database.
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <gnunet/gnunet_util_lib.h>
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#include <gnunet/gnunet_json_lib.h>
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#include <jansson.h>
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#include <microhttpd.h>
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#include <pthread.h>
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#include "taler_json_lib.h"
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#include "taler_mhd_lib.h"
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#include "taler-exchange-httpd_purses_deposit.h"
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#include "taler-exchange-httpd_responses.h"
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#include "taler_exchangedb_lib.h"
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#include "taler-exchange-httpd_keys.h"
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/**
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* Information about an individual coin being deposited.
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*/
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struct Coin
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{
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/**
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* Public information about the coin.
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*/
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struct TALER_CoinPublicInfo cpi;
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/**
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* Signature affirming spending the coin.
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*/
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struct TALER_CoinSpendSignatureP coin_sig;
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/**
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* Amount to be put into the purse from this coin.
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*/
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struct TALER_Amount amount;
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/**
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* Deposit fee applicable for this coin.
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*/
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struct TALER_Amount deposit_fee;
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/**
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* Amount to be put into the purse from this coin.
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*/
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struct TALER_Amount amount_minus_fee;
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/**
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* ID of the coin in known_coins.
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*/
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uint64_t known_coin_id;
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};
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/**
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* Closure for #deposit_transaction.
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*/
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struct PurseDepositContext
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{
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/**
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* Public key of the purse we are creating.
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*/
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const struct TALER_PurseContractPublicKeyP *purse_pub;
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/**
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* Total amount to be put into the purse.
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*/
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struct TALER_Amount amount;
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/**
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* Total actually deposited by all the coins.
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*/
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struct TALER_Amount deposit_total;
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/**
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* When should the purse expire.
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*/
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struct GNUNET_TIME_Timestamp purse_expiration;
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/**
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* Our current time.
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*/
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struct GNUNET_TIME_Timestamp exchange_timestamp;
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/**
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* Array of coins being deposited.
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*/
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struct Coin *coins;
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/**
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* Length of the @e coins array.
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*/
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unsigned int num_coins;
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/**
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* Minimum age for deposits into this purse.
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*/
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uint32_t min_age;
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};
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/**
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* Send confirmation of purse creation success to client.
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*
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* @param connection connection to the client
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* @param pcc details about the request that succeeded
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* @return MHD result code
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*/
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static MHD_RESULT
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reply_deposit_success (struct MHD_Connection *connection,
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const struct PurseDepositContext *pcc)
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{
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struct TALER_ExchangePublicKeyP pub;
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struct TALER_ExchangeSignatureP sig;
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enum TALER_ErrorCode ec;
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if (TALER_EC_NONE !=
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(ec = TALER_exchange_online_purse_deposited_sign (
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&TEH_keys_exchange_sign_,
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pcc->exchange_timestamp,
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pcc->purse_expiration,
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&pcc->amount,
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&pcc->deposit_total,
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pcc->purse_pub,
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&pub,
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&sig)))
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{
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GNUNET_break (0);
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return TALER_MHD_reply_with_ec (connection,
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ec,
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NULL);
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}
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return TALER_MHD_REPLY_JSON_PACK (
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connection,
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MHD_HTTP_OK,
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TALER_JSON_pack_amount ("total_deposited",
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&pcc->deposit_total),
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GNUNET_JSON_pack_timestamp ("exchange_timestamp",
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pcc->exchange_timestamp),
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GNUNET_JSON_pack_data_auto ("exchange_sig",
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&sig),
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GNUNET_JSON_pack_data_auto ("exchange_pub",
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&pub));
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}
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/**
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* Execute database transaction for /purses/$PID/deposit. Runs the transaction
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* logic; IF it returns a non-error code, the transaction logic MUST NOT queue
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* a MHD response. IF it returns an hard error, the transaction logic MUST
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* queue a MHD response and set @a mhd_ret. IF it returns the soft error
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* code, the function MAY be called again to retry and MUST not queue a MHD
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* response.
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*
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* @param cls a `struct PurseDepositContext`
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* @param connection MHD request context
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* @param[out] mhd_ret set to MHD status on error
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* @return transaction status
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*/
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static enum GNUNET_DB_QueryStatus
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deposit_transaction (void *cls,
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struct MHD_Connection *connection,
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MHD_RESULT *mhd_ret)
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{
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struct PurseDepositContext *pcc = cls;
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enum GNUNET_DB_QueryStatus qs;
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bool in_conflict = true;
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for (unsigned int i = 0; i<pcc->num_coins; i++)
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{
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struct Coin *coin = &pcc->coins[i];
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bool balance_ok = false;
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bool conflict = true;
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qs = TEH_plugin->do_purse_deposit (TEH_plugin->cls,
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pcc->purse_pub,
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&coin->cpi.coin_pub,
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&coin->amount,
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&coin->coin_sig,
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&coin->amount_minus_fee,
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&balance_ok,
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&conflict);
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if (qs <= 0)
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{
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if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
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return qs;
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TALER_LOG_WARNING (
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"Failed to store purse deposit information in database\n");
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*mhd_ret = TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_STORE_FAILED,
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"purse deposit deposit");
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return qs;
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}
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if (! balance_ok)
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{
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*mhd_ret
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= TEH_RESPONSE_reply_coin_insufficient_funds (
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connection,
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TALER_EC_EXCHANGE_GENERIC_INSUFFICIENT_FUNDS,
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&coin->cpi.coin_pub);
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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if (conflict)
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{
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struct TALER_Amount amount;
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struct TALER_CoinSpendPublicKeyP coin_pub;
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struct TALER_CoinSpendSignatureP coin_sig;
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char *partner_url = NULL;
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TEH_plugin->rollback (TEH_plugin->cls);
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qs = TEH_plugin->get_purse_deposit (TEH_plugin->cls,
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pcc->purse_pub,
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&coin->cpi.coin_pub,
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&amount,
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&coin_sig,
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&partner_url);
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if (qs < 0)
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{
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GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR != qs);
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TALER_LOG_WARNING (
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"Failed to fetch purse deposit information from database\n");
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*mhd_ret = TALER_MHD_reply_with_error (connection,
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MHD_HTTP_INTERNAL_SERVER_ERROR,
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TALER_EC_GENERIC_DB_FETCH_FAILED,
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"get purse deposit");
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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*mhd_ret
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= TALER_MHD_REPLY_JSON_PACK (
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connection,
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MHD_HTTP_CONFLICT,
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TALER_JSON_pack_ec (
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TALER_EC_EXCHANGE_PURSE_DEPOSIT_CONFLICTING_META_DATA),
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GNUNET_JSON_pack_data_auto ("coin_pub",
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&coin_pub),
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GNUNET_JSON_pack_data_auto ("coin_sig",
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&coin_sig),
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GNUNET_JSON_pack_allow_null (
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GNUNET_JSON_pack_string ("partner_url",
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partner_url)),
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TALER_JSON_pack_amount ("amount",
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&amount));
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GNUNET_free (partner_url);
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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}
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return qs;
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}
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/**
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* Parse a coin and check signature of the coin and the denomination
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* signature over the coin.
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*
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* @param[in,out] our HTTP connection
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* @param[in,out] request context
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* @param[out] coin coin to initialize
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* @param jcoin coin to parse
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* @return #GNUNET_OK on success, #GNUNET_NO if an error was returned,
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* #GNUNET_SYSERR on failure and no error could be returned
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*/
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static enum GNUNET_GenericReturnValue
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parse_coin (struct MHD_Connection *connection,
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struct PurseDepositContext *pcc,
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struct Coin *coin,
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const json_t *jcoin)
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{
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struct GNUNET_JSON_Specification spec[] = {
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TALER_JSON_spec_amount ("amount",
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TEH_currency,
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&coin->amount),
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GNUNET_JSON_spec_fixed_auto ("denom_pub_hash",
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&coin->cpi.denom_pub_hash),
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TALER_JSON_spec_denom_sig ("ub_sig",
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&coin->cpi.denom_sig),
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GNUNET_JSON_spec_mark_optional (
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GNUNET_JSON_spec_fixed_auto ("h_age_commitment",
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&coin->cpi.h_age_commitment),
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&coin->cpi.no_age_commitment),
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GNUNET_JSON_spec_fixed_auto ("coin_sig",
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&coin->coin_sig),
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GNUNET_JSON_spec_fixed_auto ("coin_pub",
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&coin->cpi.coin_pub),
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GNUNET_JSON_spec_end ()
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};
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{
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enum GNUNET_GenericReturnValue res;
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res = TALER_MHD_parse_json_data (connection,
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jcoin,
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spec);
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if (GNUNET_OK != res)
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return res;
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}
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if (GNUNET_OK !=
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TALER_wallet_purse_deposit_verify (TEH_base_url,
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pcc->purse_pub,
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&pcc->amount,
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&coin->cpi.coin_pub,
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&coin->coin_sig))
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{
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TALER_LOG_WARNING ("Invalid signature on /purses/$PID/deposit request\n");
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GNUNET_JSON_parse_free (spec);
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return (MHD_YES ==
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TALER_MHD_reply_with_error (connection,
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MHD_HTTP_FORBIDDEN,
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TALER_EC_EXCHANGE_PURSE_DEPOSIT_COIN_SIGNATURE_INVALID,
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TEH_base_url))
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? GNUNET_NO : GNUNET_SYSERR;
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}
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/* check denomination exists and is valid */
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{
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struct TEH_DenominationKey *dk;
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MHD_RESULT mret;
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dk = TEH_keys_denomination_by_hash (&coin->cpi.denom_pub_hash,
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connection,
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&mret);
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if (NULL == dk)
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{
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GNUNET_JSON_parse_free (spec);
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return (MHD_YES == mret) ? GNUNET_NO : GNUNET_SYSERR;
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}
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if (0 > TALER_amount_cmp (&dk->meta.value,
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&coin->amount))
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{
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GNUNET_break_op (0);
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GNUNET_JSON_parse_free (spec);
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return (MHD_YES ==
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TALER_MHD_reply_with_error (connection,
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MHD_HTTP_BAD_REQUEST,
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TALER_EC_EXCHANGE_GENERIC_AMOUNT_EXCEEDS_DENOMINATION_VALUE,
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NULL))
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? GNUNET_NO : GNUNET_SYSERR;
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}
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if (GNUNET_TIME_absolute_is_past (dk->meta.expire_deposit.abs_time))
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{
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/* This denomination is past the expiration time for deposits */
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GNUNET_JSON_parse_free (spec);
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return (MHD_YES ==
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TEH_RESPONSE_reply_expired_denom_pub_hash (
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connection,
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&coin->cpi.denom_pub_hash,
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TALER_EC_EXCHANGE_GENERIC_DENOMINATION_EXPIRED,
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"PURSE DEPOSIT"))
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? GNUNET_NO : GNUNET_SYSERR;
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}
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if (GNUNET_TIME_absolute_is_future (dk->meta.start.abs_time))
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{
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/* This denomination is not yet valid */
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GNUNET_JSON_parse_free (spec);
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return (MHD_YES ==
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TEH_RESPONSE_reply_expired_denom_pub_hash (
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connection,
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&coin->cpi.denom_pub_hash,
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TALER_EC_EXCHANGE_GENERIC_DENOMINATION_VALIDITY_IN_FUTURE,
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"PURSE DEPOSIT"))
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? GNUNET_NO : GNUNET_SYSERR;
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}
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if (dk->recoup_possible)
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{
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/* This denomination has been revoked */
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GNUNET_JSON_parse_free (spec);
|
||||||
|
return (MHD_YES ==
|
||||||
|
TEH_RESPONSE_reply_expired_denom_pub_hash (
|
||||||
|
connection,
|
||||||
|
&coin->cpi.denom_pub_hash,
|
||||||
|
TALER_EC_EXCHANGE_GENERIC_DENOMINATION_REVOKED,
|
||||||
|
"PURSE DEPOSIT"))
|
||||||
|
? GNUNET_NO : GNUNET_SYSERR;
|
||||||
|
}
|
||||||
|
if (dk->denom_pub.cipher != coin->cpi.denom_sig.cipher)
|
||||||
|
{
|
||||||
|
/* denomination cipher and denomination signature cipher not the same */
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
return (MHD_YES ==
|
||||||
|
TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_BAD_REQUEST,
|
||||||
|
TALER_EC_EXCHANGE_GENERIC_CIPHER_MISMATCH,
|
||||||
|
NULL))
|
||||||
|
? GNUNET_NO : GNUNET_SYSERR;
|
||||||
|
}
|
||||||
|
|
||||||
|
coin->deposit_fee = dk->meta.fees.deposit;
|
||||||
|
if (0 < TALER_amount_cmp (&coin->deposit_fee,
|
||||||
|
&coin->amount))
|
||||||
|
{
|
||||||
|
GNUNET_break_op (0);
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_BAD_REQUEST,
|
||||||
|
TALER_EC_EXCHANGE_DEPOSIT_NEGATIVE_VALUE_AFTER_FEE,
|
||||||
|
NULL);
|
||||||
|
}
|
||||||
|
GNUNET_assert (0 <=
|
||||||
|
TALER_amount_subtract (&coin->amount_minus_fee,
|
||||||
|
&coin->amount,
|
||||||
|
&coin->deposit_fee));
|
||||||
|
/* check coin signature */
|
||||||
|
switch (dk->denom_pub.cipher)
|
||||||
|
{
|
||||||
|
case TALER_DENOMINATION_RSA:
|
||||||
|
TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_RSA]++;
|
||||||
|
break;
|
||||||
|
case TALER_DENOMINATION_CS:
|
||||||
|
TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_CS]++;
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (GNUNET_YES !=
|
||||||
|
TALER_test_coin_valid (&coin->cpi,
|
||||||
|
&dk->denom_pub))
|
||||||
|
{
|
||||||
|
TALER_LOG_WARNING ("Invalid coin passed for /deposit\n");
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
return (MHD_YES ==
|
||||||
|
TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_FORBIDDEN,
|
||||||
|
TALER_EC_EXCHANGE_DENOMINATION_SIGNATURE_INVALID,
|
||||||
|
NULL))
|
||||||
|
? GNUNET_NO : GNUNET_SYSERR;
|
||||||
|
}
|
||||||
|
if (0 >
|
||||||
|
TALER_amount_add (&pcc->deposit_total,
|
||||||
|
&pcc->deposit_total,
|
||||||
|
&coin->amount_minus_fee))
|
||||||
|
{
|
||||||
|
GNUNET_break (0);
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_INTERNAL_SERVER_ERROR,
|
||||||
|
TALER_EC_GENERIC_FAILED_COMPUTE_AMOUNT,
|
||||||
|
"total deposit contribution");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
{
|
||||||
|
MHD_RESULT mhd_ret = MHD_NO;
|
||||||
|
enum GNUNET_DB_QueryStatus qs;
|
||||||
|
|
||||||
|
/* make sure coin is 'known' in database */
|
||||||
|
for (unsigned int tries = 0; tries<MAX_TRANSACTION_COMMIT_RETRIES; tries++)
|
||||||
|
{
|
||||||
|
qs = TEH_make_coin_known (&coin->cpi,
|
||||||
|
connection,
|
||||||
|
&coin->known_coin_id,
|
||||||
|
&mhd_ret);
|
||||||
|
/* no transaction => no serialization failures should be possible */
|
||||||
|
if (GNUNET_DB_STATUS_SOFT_ERROR != qs)
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
|
||||||
|
{
|
||||||
|
GNUNET_break (0);
|
||||||
|
return (MHD_YES ==
|
||||||
|
TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_INTERNAL_SERVER_ERROR,
|
||||||
|
TALER_EC_GENERIC_DB_COMMIT_FAILED,
|
||||||
|
"make_coin_known"))
|
||||||
|
? GNUNET_NO : GNUNET_SYSERR;
|
||||||
|
}
|
||||||
|
if (qs < 0)
|
||||||
|
return (MHD_YES == mhd_ret) ? GNUNET_NO : GNUNET_SYSERR;
|
||||||
|
}
|
||||||
|
return GNUNET_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
MHD_RESULT
|
||||||
|
TEH_handler_purses_deposit (
|
||||||
|
struct MHD_Connection *connection,
|
||||||
|
const struct TALER_PurseContractPublicKeyP *purse_pub,
|
||||||
|
const json_t *root)
|
||||||
|
{
|
||||||
|
struct PurseDepositContext pcc = {
|
||||||
|
.purse_pub = purse_pub,
|
||||||
|
.exchange_timestamp = GNUNET_TIME_timestamp_get ()
|
||||||
|
};
|
||||||
|
json_t *deposits;
|
||||||
|
json_t *deposit;
|
||||||
|
unsigned int idx;
|
||||||
|
struct GNUNET_JSON_Specification spec[] = {
|
||||||
|
GNUNET_JSON_spec_json ("deposits",
|
||||||
|
&deposits),
|
||||||
|
GNUNET_JSON_spec_end ()
|
||||||
|
};
|
||||||
|
|
||||||
|
{
|
||||||
|
enum GNUNET_GenericReturnValue res;
|
||||||
|
|
||||||
|
res = TALER_MHD_parse_json_data (connection,
|
||||||
|
root,
|
||||||
|
spec);
|
||||||
|
if (GNUNET_SYSERR == res)
|
||||||
|
{
|
||||||
|
GNUNET_break (0);
|
||||||
|
return MHD_NO; /* hard failure */
|
||||||
|
}
|
||||||
|
if (GNUNET_NO == res)
|
||||||
|
{
|
||||||
|
GNUNET_break_op (0);
|
||||||
|
return MHD_YES; /* failure */
|
||||||
|
}
|
||||||
|
}
|
||||||
|
GNUNET_assert (GNUNET_OK ==
|
||||||
|
TALER_amount_set_zero (TEH_currency,
|
||||||
|
&pcc.deposit_total));
|
||||||
|
pcc.num_coins = json_array_size (deposits);
|
||||||
|
if ( (0 == pcc.num_coins) ||
|
||||||
|
(pcc.num_coins > TALER_MAX_FRESH_COINS) )
|
||||||
|
{
|
||||||
|
GNUNET_break_op (0);
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_BAD_REQUEST,
|
||||||
|
TALER_EC_GENERIC_PARAMETER_MALFORMED,
|
||||||
|
"deposits");
|
||||||
|
}
|
||||||
|
/* FIXME: fetch basic purse properties
|
||||||
|
(min age, purse_expiration, amount) from
|
||||||
|
DB. Generate 404 or 410 (Gone) replies if
|
||||||
|
applicable. */
|
||||||
|
|
||||||
|
/* parse deposits */
|
||||||
|
pcc.coins = GNUNET_new_array (pcc.num_coins,
|
||||||
|
struct Coin);
|
||||||
|
json_array_foreach (deposits, idx, deposit)
|
||||||
|
{
|
||||||
|
enum GNUNET_GenericReturnValue res;
|
||||||
|
struct Coin *coin = &pcc.coins[idx];
|
||||||
|
|
||||||
|
res = parse_coin (connection,
|
||||||
|
&pcc,
|
||||||
|
coin,
|
||||||
|
deposit);
|
||||||
|
if (GNUNET_OK != res)
|
||||||
|
{
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
GNUNET_free (pcc.coins);
|
||||||
|
return (GNUNET_NO == res) ? MHD_YES : MHD_NO;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (GNUNET_SYSERR ==
|
||||||
|
TEH_plugin->preflight (TEH_plugin->cls))
|
||||||
|
{
|
||||||
|
GNUNET_break (0);
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
GNUNET_free (pcc.coins);
|
||||||
|
return TALER_MHD_reply_with_error (connection,
|
||||||
|
MHD_HTTP_INTERNAL_SERVER_ERROR,
|
||||||
|
TALER_EC_GENERIC_DB_START_FAILED,
|
||||||
|
"preflight failure");
|
||||||
|
}
|
||||||
|
|
||||||
|
/* execute transaction */
|
||||||
|
{
|
||||||
|
MHD_RESULT mhd_ret;
|
||||||
|
|
||||||
|
if (GNUNET_OK !=
|
||||||
|
TEH_DB_run_transaction (connection,
|
||||||
|
"execute purse deposit",
|
||||||
|
TEH_MT_REQUEST_PURSE_DEPOSIT,
|
||||||
|
&mhd_ret,
|
||||||
|
&deposit_transaction,
|
||||||
|
&pcc))
|
||||||
|
{
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
GNUNET_free (pcc.coins);
|
||||||
|
return mhd_ret;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* generate regular response */
|
||||||
|
{
|
||||||
|
MHD_RESULT res;
|
||||||
|
|
||||||
|
res = reply_deposit_success (connection,
|
||||||
|
&pcc);
|
||||||
|
GNUNET_free (pcc.coins);
|
||||||
|
GNUNET_JSON_parse_free (spec);
|
||||||
|
return res;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/* end of taler-exchange-httpd_purses_deposit.c */
|
||||||
Loading…
Reference in New Issue
Block a user